First the combination of Windows Key + I has to be pressed. A side bar will appear on your screen. Click the More PC Settings viewed on the bottom of the screen.
Next you will have to move towards the General section once the new Metro Control Panel loads.
The app switching is enabled by default. You can view it on the right side of the window.
Slide the side bar towards the left side and you will succeed in disabling the feature. That's it! Now you can enjoy your task after disabling application switching in Windows 8.